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    Subject[PATCH v2] iio: adc: exynos_adc: Add support for exynos7
    Date
    The ADC on exynos7 is quite similar to ADCv2. The differences are as
    follows:
    - exynos7-adc has 8 input channels (as against 10 in ADCv2).
    - exynos7 does not include an ADC PHY control register.
    - Some ADC_CON2 register bits being used in ADCv2 are listed as
    reserved in exynos7-adc. This results in a different init_hw
    function for exynos7.

    Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
    ---
    - Based on Naveen's "iio: exynos-adc: use syscon instead of ioremap" patchset
    http://comments.gmane.org/gmane.linux.kernel.iio/13943

    .../devicetree/bindings/arm/samsung/exynos-adc.txt | 2 ++
    drivers/iio/adc/exynos_adc.c | 32 ++++++++++++++++++++++
    2 files changed, 34 insertions(+)

    diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
    index c368210..f46ca9a 100644
    --- a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
    +++ b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
    @@ -16,6 +16,8 @@ Required properties:
    future controllers.
    Must be "samsung,exynos3250-adc" for
    controllers compatible with ADC of Exynos3250.
    + Must be "samsung,exynos7-adc" for
    + the ADC in Exynos7 and compatibles
    Must be "samsung,s3c2410-adc" for
    the ADC in s3c2410 and compatibles
    Must be "samsung,s3c2416-adc" for
    diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
    index fe03177..3a2dbb3 100644
    --- a/drivers/iio/adc/exynos_adc.c
    +++ b/drivers/iio/adc/exynos_adc.c
    @@ -390,6 +390,35 @@ static const struct exynos_adc_data exynos3250_adc_data = {
    .start_conv = exynos_adc_v2_start_conv,
    };

    +static void exynos_adc_exynos7_init_hw(struct exynos_adc *info)
    +{
    + u32 con1, con2;
    +
    + if (info->data->needs_adc_phy)
    + regmap_write(info->pmu_map, info->data->phy_offset, 1);
    +
    + con1 = ADC_V2_CON1_SOFT_RESET;
    + writel(con1, ADC_V2_CON1(info->regs));
    +
    + con2 = readl(ADC_V2_CON2(info->regs));
    + con2 &= ~ADC_V2_CON2_C_TIME(7);
    + con2 |= ADC_V2_CON2_C_TIME(0);
    + writel(con2, ADC_V2_CON2(info->regs));
    +
    + /* Enable interrupts */
    + writel(1, ADC_V2_INT_EN(info->regs));
    +}
    +
    +static const struct exynos_adc_data exynos7_adc_data = {
    + .num_channels = MAX_ADC_V1_CHANNELS,
    + .mask = ADC_DATX_MASK, /* 12 bit ADC resolution */
    +
    + .init_hw = exynos_adc_exynos7_init_hw,
    + .exit_hw = exynos_adc_v2_exit_hw,
    + .clear_irq = exynos_adc_v2_clear_irq,
    + .start_conv = exynos_adc_v2_start_conv,
    +};
    +
    static const struct of_device_id exynos_adc_match[] = {
    {
    .compatible = "samsung,s3c2410-adc",
    @@ -415,6 +444,9 @@ static const struct of_device_id exynos_adc_match[] = {
    }, {
    .compatible = "samsung,exynos3250-adc",
    .data = &exynos3250_adc_data,
    + }, {
    + .compatible = "samsung,exynos7-adc",
    + .data = &exynos7_adc_data,
    },
    {},
    };
    --
    2.1.0


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